A suggestion RE Xfail tests

[Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>]

It would be helpful if tests that are expected to fail could list both
the expected "correct" result (that is, the result if the test were to
succeed, which would cause the Xfail test to fail) and the expected
"wrong" output ... so that if the way a test goes wrong changes, that
too can be seen.

Yes, this can be done now by repeating the test twice, once as an
xfail and once as a regular test but with the "broken" result ... but
it might be easier to keep track of if it were all in one place.

(No action on this expected pre-5.9-release, just musing.)